Stampian
preferred label: استامپین @fa
type: Concept
broader: lower Oligocene

lower Oligocene
narrower: Stampian
narrower: Rupelian
narrower: Sannoisian
narrower: Chadronian
narrower: Chadron Formation
related: upper Oligocene
related: middle Oligocene
related: Khangiran Formation
broader: Oligocene
type: Concept
preferred label: الیگوسن زیرین @fa

Rupelian
preferred label: روپلین @fa
type: Concept
broader: lower Oligocene

Sannoisian
preferred label: سانویزین @fa
type: Concept
broader: lower Oligocene

Chadronian
preferred label: چادرونین @fa
type: Concept
broader: lower Oligocene

Chadron Formation
preferred label: سازند چادرون @fa
type: Concept
broader: lower Oligocene

upper Oligocene
preferred label: الیگوسن فوقانی @fa
type: Concept
related: lower Oligocene

middle Oligocene
preferred label: الیگوسن میانی @fa
type: Concept
related: lower Oligocene

Khangiran Formation
preferred label: سازند خانگیران @fa
type: Concept
related: lower Oligocene

Oligocene
preferred label: الیگوسن @fa
type: Concept
narrower: lower Oligocene